Refraction can be demonstrated by dropping ... Explain to students that seismic waves travel fast, on the order of kilometers per second. The speed of a seismic wave depends on many factors.

there is a sudden change in direction due to refraction. A surface wave travels along the surface of the Earth. It is the slowest of the three types of seismic wave. Surface waves usually have ...

Fifteen minutes before the massive January 2022 eruption of the Hunga Tonga-Hunga Ha'apai volcano, a seismic wave was ...